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Interlayer Engineering of Molybdenum Trioxide toward High‐Capacity and Stable Sodium Ion Half/Full Batteries
Author(s) -
Wang Bo,
Ang Edison Huixiang,
Yang Yang,
Zhang Yufei,
Geng Hongbo,
Ye Minghui,
Li Cheng Chao
Publication year - 2020
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202001708
Subject(s) - materials science , molybdenum trioxide , anode , intercalation (chemistry) , molybdenum , molecule , density functional theory , chemical engineering , ion , electrode , inorganic chemistry , nanotechnology , chemistry , organic chemistry , computational chemistry , metallurgy , engineering
Orthorhombic molybdenum trioxide (MoO 3 ) is one of the most promising anode materials for sodium‐ion batteries because of its rich chemistry associated with multiple valence states and intriguing layered structure. However, MoO 3 still suffers from the low rate capability and poor cycle induced by pulverization during de/sodiation. An ingenious two‐step synthesis strategy to fine tune the layer structure of MoO 3 targeting stable and fast sodium ionic diffusion channels is reported here. By integrating partially reduction and organic molecule intercalation methodologies, the interlayer spacing of MoO 3 is remarkably enlarged to 10.40 Å and the layer structural integration are reinforced by dimercapto groups of bismuththiol molecules. Comprehensive characterizations and density functional theory calculations prove that the intercalated bismuththiol (DMcT) molecules substantially enhanced electronic conductivity and effectively shield the electrostatic interaction between Na + and the MoO 3 host by conjugated double bond, resulting in improved Na + insertion/extraction kinetics. Benefiting from these features, the newly devised layered MoO 3 electrode achieves excellent long‐term cycling stability and outstanding rate performance. These achievements are of vital significance for the preparation of sodium‐ion battery anode materials with high‐rate capability and long cycling life using intercalation chemistry.